I had two of these before .... both had ST60 with tuned pipe ..... could rise vertically out of hand. Performance is just truly amazing for a high winger. This is down to the fat semi symet wing it has.

I have available two power systems that will give similar to my 1980's setup :

So I have a choice .....

ASP61 glow

or

4250 650kv + 4S / 5S LiPo

Interesting that weights come out similar around the 780gr for both systems ....

Thats a lot of weight up front and I am thinking to move servos to the rear of fuselage to balance out instead of the factory position below the wing. This will give direct surface connection ... no need for corrective weight to balance power system ...

Looks like I will be fitting the ASP 61 .... similar to my WOT4's of the 1980's I had ... with ST60 ...

I know this is Wattflyer ... but thought it might be interesting for some ...

I did think about the E system - but it needs extra mount boxes and battery trays etc. that all add up in weight.
The ASP is basically a bolt on and fuel tank slides into place.

I also amended the tailwheel set-up to Chris Foss original where he used a rubber band as shock absorber link ... just means bend the stock wire close to the plastic mount horizontal to bottom of rudder ... bend a hook and cut of excess. Then embed a U wire into rudder to take the band ...

Chris's original tailwheel steering idea from the 80's ... instead of the wire rod into the rudder hinge line. This allows shock absorbing and reduces risk of rudder failure :

CoG spot on

Turnigy Propdrive 4250 650kv, 50A ESC, 13x8E prop
LiPo is set up for single 5S 3000mAh ... but its a very tight squeeze to get it in ... so I picked a compromise prop in the 13x8 that allows me to parallel twin 4S 1600 packs.

The servo extenders I had on Rudder and Elevator arms have now been removed, standard arms with same stroke length of horn / arms now .... Tx DR full rate increased to compensate and regain resolution.

Wheels - Sullivan Skylite 3" have been fitted to replace the smaller stock wheels, that should help with the nose overs on grass.

Just waiting for weather to improve so I can go fly her again.

I had plain forgot how good the WOT4 is ... now its making me hanker after the AcroWot - to replace my Zlin Z50 I crashed.

The 5S combo pulled the motor box apart during a flight ... but luckily the damage on crashing was minimal.

I decided to replace the ply box with alloy Stand-offs fixed to the firewall which is suitable for Glow motors.
I repositioned the threaded fixings and bolted up .... she lined up perfect with just enough gap spinner to cowl.

The thrust line was slightly less down than previous so I expected a slight trim adjustment ...

As usual she took off like a scalded cat ! 5S makes her 'ballistic' ! But the trim was spot on literally ... and she tracked nicely showing the prop line was good.

Here's the video ... (I think battery ran out on my Headcam and why the video cuts short ... )